Rivera has been suspended for four years by the USADA due to an anti-doping violation. According to the report, "Rivera, 36, tested positive for clenbuterol as the result of an out-of-competition urine sample he provided on July 23, 2016."

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Violation caused by tainted meat?

BantamweightUFC

Out

August 18, 2016

Rivera disclosed Wednesday that his positive test was for the banned substance clenbuterol, which he believes he ingested via "tainted meat" consumed in a recent trip to Mexico, MMAFighting.com reports.

UFC officials indicated Wednesday evening that Rivera has been tagged for using a banned substance by the USADA, Fox Sports reports. The test was taken a week prior to his fight against Erik Perez at UFC 201.